Measurement of thermal expansion and thermo-optic coefficients in LiNbO3 and KTiOPO4 crystals using dual-interferometric techniques

Felice Pignatiello, Maurizio De Rosa, Pietro Ferraro, Simonetta Grilli, Sergio De Nicola, Ady Arie, Paolo De Natale

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We describe a dual-interferometric setup for simultaneous and independent measurement of the thermal expansion coefficient and thermo-optic coefficients in ferroelectric crystals (LiNbO3 and KTiOPO4). The crystal temperature varies from room temperature up to 200°C by an actively stabilized oven. The thermal expansion coefficient is determined using a moiré interferometer and monitoring, as a function of the temperature, the period of a grating written on one side of the crystal sample. The thermo-optic coefficients of the ordinary and extraordinary axes of LiNbO 3 crystal are estimated by measuring the optical path variation measured using a Mach-Zehnder interferometer.

Original languageEnglish
Title of host publicationSpeckle06
Subtitle of host publicationSpeckles, From Grains to Flowers
DOIs
StatePublished - 2006
EventSpeckle06: Speckles, From Grains to Flowers - Nimes, France
Duration: 13 Sep 200615 Sep 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6341
ISSN (Print)0277-786X

Conference

ConferenceSpeckle06: Speckles, From Grains to Flowers
Country/TerritoryFrance
CityNimes
Period13/09/0615/09/06

Keywords

  • Ferroelectric crystal
  • Moiré interferometer
  • Thermal expansion coefficient
  • Thermo-optic coefficient

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